Managing the Properties of Lu2O3:Tb,Hf Storage Phosphor by Means of Fabrication Conditions

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• 作者：Dagmara Kulesza ; Eugeniusz Zych
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：December 27, 2013
• 年：2013
• 卷：117
• 期：51
• 页码：26921-26928
• 全文大小：426K
• ISSN：1932-7455

文摘

Lu₂O₃:Tb,Hf ceramics prepared at 1700 掳C were found as an efficient storage phosphor with the main TL band around 250 掳C composed of three overlapping components. Their respective trap depths are of 1.37, 1.35, and 0.86 eV. The latest, although rather shallow, gave TL at the highest temperature (around 300 掳C) due to a very low frequency factor of 6 脳 10⁶ s^鈥?. The most efficient thermoluminescence was observed from material containing 0.1% of Tb and 0.2% of Hf and prepared in a vacuum. Analogous compositions made in air or forming gas also stored energy, and their glow curves were very similar in shape. The glow band faded at ambient conditions by about 50% within 5 days, much faster than predicted by the Arrhenius-type behavior. Thermoluminescence and optically stimulated luminescence (with 400鈥?40 nm light) produced the green emission of Tb³⁺ ion, exclusively. High energy UV- or X-ray photons induced a broad band absorption in the range of 320鈥?00 nm with maximum around 375 nm. This band could be bleached out by continuous irradiation into it or by heating. Isothermal decay traces consisted of three single-exponential components, whose parameters were consistent with the first-order kinetics of thermoluminescence and with the derived trap parameters.